These belts for the AutoTrickler are standard 70A hardness #152 size o-rings. These are 3/32" thick which is larger than the 1/16" o-rings we used until 2017.
The belts may break down over time if you are in a dry climate. To extend their life you can remove the belt from the AutoTrickler when not in use and store in a sealed bag.
Includes a set of 5 belts.